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COROTRON SHIELD AND CATALYTIC FILTER

Publishing Venue

Xerox Disclosure Journal

Abstract

This proposal is directed to an improved corona discharge device having incorporated within its field a nickel hydroxide catalyst. It is well known that the production of a corona discharge in air usually generates ozone which adversely affects uniform charging and which, even in very small quantities, is con-sidered toxic to humans. Ozone emissions in an environment are generally controlled by "filtering" devices which are impregnated with catalysts capable of conversion of the ozone to relatively harmless substances. Ozone "filtering" devices for electrostatographic copiers have been located in the copier exhaust stream. These devices are generally charac-terized as fixed head devices; that is, the catalysts are impregnated into a porous support which is integrated within the copier exhaust housing as disclosed in IBM Technical Disclosure Bulletin, Vol. 11:8, January 1969. Alternatively, the catalysts have been incorporated in the corona discharge electrode structure itself as described in U.S. Patent 3,675,096.

Country

Undisclosed

Language

English (United States)

This text was extracted from a PDF file.

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This is the abbreviated version, containing approximately
38% of the total text.

Page 1 of 6

XEROX DISCLOSURE JOURNAL

COROTRON SHIELD AND CATALYTICFILTERRinoud HennaGeorge J~ Safford

Proposed ClassifIcationU~S. Cl. 317/262Amt. Cl~ HOlg

2

2

FIG. /

3

/11111

Volume 3 Number 5 September/October 1978 323

FIG, 2

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Page 2 of 6

COROTRON SHIELD AND CATALYTIC FILTER (Cont 'd)

This proposal is directed to an improved corona dischargedevice having incorporated within its field a nickel hydroxidecatalyst.

It is well known that the production of a corona discharge inair usually generates ozone which adversely affects uniformcharging and which, even in very small quantities, is con-sidered toxic to humans. Ozone emissions in an environmentare generally controlled by "filtering" devices which areimpregnated with catalysts capable of conversion of the ozoneto relatively harmless substances. Ozone "filtering" devicesfor electrostatographic copiers have been located in thecopier exhaust stream. These devices are generally charac-terized as fixed head devices; that is, the catalysts areimpregnated into a porous support which is integrated withinthe copier exhaust housing as disclosed in IBM TechnicalDisclosure Bulletin, Vol. 11:8, January 1969. Alternatively,the catalysts have been incorporated in the corona dischargeelectrode structure itself as described in U.S. Patent3,675,096.

In accordance with the present disclosure, the corona-generating device suitable for application of a substantiallyuniform electrostatic charge to a surface comprises a sup-porting frame, insulating supports arrayed within thesupporting frame for attachment of a corotron wire, anelectrical lead to that corotron wire and a conductive mesh offoraminous screen enveloping the supporting frame and adaptedfor the retention of a catalytically active compositioncapable of neutralization of ozone generated during operationof the corona-generating device. In essence, the corotronshield is converted into a housing in which supported catalystis directly and compactly incorporated. The catalyticallyactive composition (catalyst) may be supported around thesupporting frame of the corona-generating device in anysuitable manner. The catalyst is preferably supported by thesupporting frame as near as possible to the corona discharge.A preferred corotron shield and catalytic filter device isshown in Figures 1 and 2.